Sorting out a Thailand SIM card is the first real decision you make after landing — and the brightly lit kiosks in arrivals are counting on you making it badly. There are four ways to get your phone online: an airport SIM, a 7-Eleven SIM, a carrier-shop SIM, or an eSIM. This guide compares the prices, the pros and cons, and which Thai network actually wins once you leave the city.
Quick answer: For the lowest price, buy a SIM at a 7-Eleven or carrier shop once you’re out of the airport. To land already connected, buy a Thailand eSIM before you fly. Skip the airport counter unless you’re too tired to care — it’s the same SIM for 30–50% more.
Thailand SIM card options at a glance
| Option | Typical price | Best for | Watch out for |
|---|---|---|---|
| Airport SIM | ฿999–1,199 (unlimited) | Late-night arrivals, zero effort | 30–50% markup vs town |
| 7-Eleven SIM | From ฿299 (e.g. 15GB/8 days) | Budget backpackers, short trips | Basic plans; need Wi-Fi to find a shop |
| Carrier shop (AIS/True) | ฿399–1,199 (5–30 days) | Heavy data, remote workers | Slightly pricier than 7-Eleven basics |
| eSIM | ~US$5–18 (8–20GB) | Landing connected, no queues | Phone must be eSIM-ready & unlocked |
Where should you buy a SIM card in Thailand?
Airport SIM counters — fast, easy, overpriced
You’ll see AIS and TrueMove H desks the moment you exit arrivals. Passport, point at a plan, pay, online in four minutes — typically ฿999–1,199 for unlimited data. The catch: the identical SIM costs 30–50% less past the arrivals hall. Worth it only if you’ve landed at 2am and can’t face the search.
7-Eleven — the budget backpacker’s classic
There’s a 7-Eleven on almost every corner, and most sell SIMs from around ฿299. Staff register it to your passport on the spot. The cheap packets are basic (think 15GB over 8 days), so heavy or long-stay users will top up before the month’s out. You’ll need airport Wi-Fi to book a Grab into town first.
Carrier shops — the overlooked best value
Every mall has an AIS or True store, and this is the pick if data is what you care about. They carry the full range of tourist and local plans, including chunky 30-day packages, plus staff who can fix a top-up that won’t apply. AIS runs roughly ฿399 (5 days unlimited), ฿699 (15 days) and ฿1,199 (30 days); True often undercuts on shorter plans.
eSIM — connected on the tarmac
If your phone supports it (most iPhones since the XS, many recent Androids), a Thailand eSIM is the slickest route: buy online, scan a QR code, switch off flight mode and you’re live. Airalo’s 8GB plan (~US$12) suits a fortnight; 20GB/30 days runs about US$18. Maybe skip unlimited eSIMs unless you tether a laptop daily — fixed data is far better value. Check your phone is unlocked and confirm which network the eSIM uses before buying. Another option is Saily – which is run by the people that brought you Nord VPN. Lastly another eSIM provider you can try is Yesim.
What “unlimited” and “top speed” actually mean
Thai networks love the word unlimited, but it rarely means what you’d assume — and the small print is where tourists get caught.
- “Unlimited at max speed” usually has a daily fair-use cap. AIS and True typically give you a few GB a day at full speed, then throttle you to a crawl until midnight, when it resets. So “unlimited” means unlimited volume, not unlimited fast data.
- “Top speed” / “max speed” is just the fast allowance you get before that throttle kicks in. The headline figures (100–500 Mbps) are theoretical ceilings, not what you’ll actually see — real speeds swing with congestion and location.
- A few plans are genuinely uncapped (no fair-use policy, no throttling), but they’re rarer and pricier. If it matters to you, scan the listing for the words “fair use policy” or a daily GB figure.
For most travellers, a few GB a day at full speed is plenty for maps, messaging and scrolling — you’d only hit the throttle by streaming HD for hours or tethering a laptop hard. Just don’t pay a premium for an “unlimited” plan expecting flat-out speed all day; that’s not what you’re buying.
AIS vs True: which Thailand network is best?
Whatever shop you buy from, your signal comes from one of two networks. dtac merged with TrueMove H in 2023 to form True Corporation, so the real choice is AIS or True.
- AIS — the largest network, strongest on islands, mountains and rural roads, fastest 5G (~177 Mbps) and ~95% national coverage. Choose AIS if you’re island-hopping or heading off-grid (Koh Tao, Pai, the north).
- True (TrueMove H) — excellent and slightly cheaper in cities and tourist hubs (Bangkok, Phuket, Pattaya), but can’t match AIS in remote areas.
Rule of thumb: going remote → AIS. Staying urban → either, and True may save a few baht.
Best Thailand SIM card by traveller type
- Budget backpacker, short trip: 7-Eleven SIM (ask for AIS if islands are on the cards).
- Wants to land connected: fixed-data eSIM (Airalo/Saily, 8–20GB).
- Digital nomad / remote worker: carrier-shop AIS SIM with a 30-day data plan.
- Island-hopper / overlander: carrier-shop SIM, AIS specifically.
- Two-week city-and-beach holiday: eSIM or airport SIM — don’t overthink it.
- Old or locked phone: physical SIM from 7-Eleven or the airport.
Pro move: a cheap eSIM to get online the second you land, swapped for a carrier-shop AIS SIM once you’re in town — instant connection and the best network, for a sensible price.
Thailand SIM card FAQ
Do I need my passport to buy a SIM card in Thailand?
Yes. Registration against your passport is required by law for any SIM bought in Thailand — airport, 7-Eleven or carrier shop. It takes a minute. eSIMs bought through international apps skip this step.
How much does a SIM card cost in Thailand?
From about ฿299 for a basic 7-Eleven packet to ฿999–1,199 for unlimited airport plans. Carrier-shop data plans run ฿399–1,199 depending on length. eSIMs cost roughly US$5–18 for 8–20GB.
Is an eSIM or a physical SIM better for Thailand?
An eSIM is best if you want to land already connected and your phone supports it. A physical carrier SIM is better value for heavy data and works on any unlocked phone. Many travellers use both.
Does “unlimited” data in Thailand really mean unlimited?
Usually it means unlimited volume, not unlimited speed. Most AIS and True “unlimited” tourist plans give you a few GB per day at full speed, then throttle to a slow speed until midnight, when it resets. A handful of plans are genuinely uncapped — check for a “fair use policy” or daily GB limit in the small print.
Which network has the best coverage in Thailand?
AIS has the widest coverage and the strongest signal on islands and in rural areas. True is excellent in cities and often slightly cheaper.
Where is the cheapest place to buy a SIM in Thailand?
A 7-Eleven or an AIS/True carrier shop in town — both undercut the airport counters by 30–50%.
Can I buy a Thailand eSIM before I arrive?
Yes, and you should. Buy and install it before you fly (you need internet to scan the QR code), then activate it on landing.
Bottom line
Skip the airport counter unless you’re exhausted. Most backpackers need nothing more than a 7-Eleven SIM; anyone working or heading off-grid should get a carrier-shop AIS SIM; and a fixed-data eSIM is the move if landing connected beats saving a few dollars. The detail that decides your trip isn’t the shop — it’s whether you’re holding AIS or True when the ferry pulls away from the mainland.
